Yes! Everything expires even if you've heard otherwise. You should check the printed expiration date on your contact lens solution to determine the expiration date. Some products use different terminology such as "Discard Date, or Best Buy: date" rather than the word expiration.
Expiration dates are a safety mechanism and don't intend to suggest a specific date is scientifically the exact date which you can not longer use a product safely... Instead they are generally agreed upon dates which you should discard a product. If you store a products well, such as a cool, dry, dark places, there is a better chance a product will be viable after the expiration date.
Final Conclusion: Contact Lens Solution is CHEAP! Just be safe and buy a new bottle.